From 04818bbdc34cb02b2590af8e5f77118ed8a8d755 Mon Sep 17 00:00:00 2001 From: Prabhakar Kushwaha Date: Thu, 12 Jun 2014 12:14:00 +0530 Subject: driver/nand: Update SRAM initialize logic for IFC. IFC controller v1.1.0 requires internal SRAM initialize by reading NAND flash. Higher controller versions have provided "SRAM init" bit in NCFGR register space. update SRAM initialize logic to reflect the same. Also print error message in case of Page read error. Signed-off-by: Prabhakar Kushwaha Reviewed-by: York Sun --- drivers/mtd/nand/fsl_ifc_nand.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) (limited to 'drivers/mtd/nand') diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c index 27f5177..280e14e 100644 --- a/drivers/mtd/nand/fsl_ifc_nand.c +++ b/drivers/mtd/nand/fsl_ifc_nand.c @@ -806,12 +806,30 @@ static void fsl_ifc_select_chip(struct mtd_info *mtd, int chip) { } -static void fsl_ifc_sram_init(void) +static int fsl_ifc_sram_init(uint32_t ver) { struct fsl_ifc *ifc = ifc_ctrl->regs; uint32_t cs = 0, csor = 0, csor_8k = 0, csor_ext = 0; + uint32_t ncfgr = 0; long long end_tick; + if (ver > FSL_IFC_V1_1_0) { + ncfgr = ifc_in32(&ifc->ifc_nand.ncfgr); + ifc_out32(&ifc->ifc_nand.ncfgr, ncfgr | IFC_NAND_SRAM_INIT_EN); + + /* wait for SRAM_INIT bit to be clear or timeout */ + end_tick = usec2ticks(IFC_TIMEOUT_MSECS * 1000) + get_ticks(); + while (end_tick > get_ticks()) { + ifc_ctrl->status = + ifc_in32(&ifc->ifc_nand.nand_evter_stat); + + if (!(ifc_ctrl->status & IFC_NAND_SRAM_INIT_EN)) + return 0; + } + printf("fsl-ifc: Failed to Initialise SRAM\n"); + return 1; + } + cs = ifc_ctrl->cs_nand >> IFC_NAND_CSEL_SHIFT; /* Save CSOR and CSOR_ext */ @@ -854,11 +872,18 @@ static void fsl_ifc_sram_init(void) break; } + if (ifc_ctrl->status != IFC_NAND_EVTER_STAT_OPC) { + printf("fsl-ifc: Failed to Initialise SRAM\n"); + return 1; + } + ifc_out32(&ifc->ifc_nand.nand_evter_stat, ifc_ctrl->status); /* Restore CSOR and CSOR_ext */ ifc_out32(&ifc_ctrl->regs->csor_cs[cs].csor, csor); ifc_out32(&ifc_ctrl->regs->csor_cs[cs].csor_ext, csor_ext); + + return 0; } static int fsl_ifc_chip_init(int devnum, u8 *addr) @@ -868,7 +893,7 @@ static int fsl_ifc_chip_init(int devnum, u8 *addr) struct fsl_ifc_mtd *priv; struct nand_ecclayout *layout; uint32_t cspr = 0, csor = 0, ver = 0; - int ret; + int ret = 0; if (!ifc_ctrl) { fsl_ifc_ctrl_init(); @@ -1010,8 +1035,10 @@ static int fsl_ifc_chip_init(int devnum, u8 *addr) } ver = ifc_in32(&ifc_ctrl->regs->ifc_rev); - if (ver == FSL_IFC_V1_1_0) - fsl_ifc_sram_init(); + if (ver >= FSL_IFC_V1_1_0) + ret = fsl_ifc_sram_init(ver); + if (ret) + return ret; ret = nand_scan_ident(mtd, 1, NULL); if (ret) -- cgit v1.1